DE2754648A1 - CHANGEABLE RESISTANCE - Google Patents

Description

December 2, 1977 IG / vh

G-nv-514

Alps Electric Co., Ltd.

1-7 Yukigaya Otsuka-Cho, üta-Ku, Tokyo, Japan 145

Changeable resistance

The iiiriindunc concerns a changeable resistance for Tone controls in stereo tape recorders or the like. Such resistance are preferably rotary resistors.

It is already known and is explained with reference to FIG. 1, in the case of an insulating support body or such a body: - with insulating substrate, resistance layers 2 and 3 to each other to be arranged opposite. The resistive layers 2 and 3 are at their respective ends on terminals 4-, 5 across respective conductor 2b or Jb connected. Other leaders or Conductor pieces 2a, 3a are to the other ends of the resistor & - layers 2,3 connected. There is a slide 8 which slides over the resistance layers 2, 3 iui <; · a collector-like component 6 is intended to contact, which is carried by an axis passed through the axis bore 9; .. If the axis is rotated, the opposite Kontrv.to 8a and 8b slide over respective resistance layers 2, 3 in opposite directions Directions, so that on both sides, as in Figure 2

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indicated, an electrical circuit for control voltages is formed.

There is now a need among experts to reduce the size of the electronic components. This is particularly true v / else for potentiometers for stereo tape Advised for motor vehicles, and there is a real need ^ vr smaller variable resistors.

However, this need cannot be changed with the known Resistors satisfied v / ground because the terminals 4.5 from opposite sides of the insulated support plate protrude and have to protrude so that they take up an inordinate amount of space.

The invention is based on the object of reducing the dimensions of the aforementioned variable resistor.

This object is achieved by the invention specified in claim 1.

While Figure 1 is a plan view of a known carrier body, Figure 2 is a graphical representation of the electrical Circuit j in a tone control shows are

Embodiments of the invention shown in the rest of the drawing and are explained in more detail below. Show it:

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Fig. 3, in plan view, the variable resistance

Fig. 4 is a section for the purpose of showing the essential parts of the variable resistance according to FIG. 3

5 shows a section through the variable resistor according to another embodiment of the invention.

From Figure 3 of the drawing, a carrier plate or such a plate with an insulating base 11 and the resistance layers 12 and 13, which have the same size and shape, can be seen.

Resistance layers 12 and I3 are present on both sides of a collector-shaped component 16, which is connected to a central terminal I7.

The first resistive layer 12 has an individually known shape in order to form a connection to the first terminal 14,

but the second resistance layer I3 has a special one, also shown in FIGS. 3 and 4 and explained in more detail below

Namely, initially, an arcuate Verbindungsieiter 21 formed at the location of the insulating plate 11 where the resistance layer are formed I3 soHte to a conductive connection to a third terminal 15, for example, by printing a silver paste to prepare. On the whole

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An insulating film 20 is applied to the surface part of the connection conductor 21 except for its two end parts. Only then is a conductor 22 formed which does not contact the conductor 21, see FIG. 4, on the side _{? where the} insulating film 20 is present and which side faces the third terminal. Finally, the resistance layer I3 is formed to connect the end 21a and the terminal-side conductor 22 to each other.

In other words, the connection conductor 22 and the lowermost conductor part 21 are from each other through the insulating film electrically isolated and are connected to one another only via the resistance layer I3.

The resistance layers are in sliding contact with sliders 18a, 18b of the slider body 18, which is supported by a common, axis not shown is carried. These slides are adjusted in the direction of arrows B and C, respectively increase or decrease the resistance by the same amount.

It can be seen from this that a variable resistor according to the invention with a pair of opposite one another Resistance layers are created on a carrier body with an insulated base, with a resistance layer under separated by an insulating intermediate layer, a conductor serving as a guide is present, which is connected to the

809831/0593 original inspected

Resistance track is connected and a conductive connection to the other end of the resistor. ' tandes so that the terminals of the two resistance layers are conveniently arranged only on one side of the support body. This results in an advantageous manner according to the invention a variable resistor, the smaller dimensions, compared with the known resistors and are connected and it is still easy to mont ^r - ^ eP. In addition, the space required for connecting the electrical switch circuit can be reduced considerably.

A variant of the invention, which is illustrated in FIG. 5, provides an arcuate conductor 21 beneath the insulating film 20 which has a "side-by-side" position at the second resistive layer 13 and with the end 1Ja the Resistive layer is connected. It can be seen that the variable resistance according to FIG. 5 is excellent in individual cases Operating characteristics as in Figs. 3 and 4- has. It is further advantageous here that the work step by which the conductor 22 was formed can still be omitted.

809831/0593 orjginal inspfcted

Claims (1)

December 5, 1977 IG / vh G-EV- Alps Electric Co., Ltd. PATENT CLAIMS 1. Variable resistor, with a pair of opposing resistors or resistors on an insulating support plate. Resistive layers are present that have at least one Conductor piece in connection with one terminal each serving as a tap stands, characterized in that a web-shaped conductor (21) is present under at least one resistance layer (13), but to the resistive layer (13) through a insulating film (20) is partially separated, the conductor (21) with only one end (13a) of the resistive layer (13) in Is connected, but this conductor (21) extends in the direction of the other end of the resistance layer (13), such that the terminals (14, 15) of both resistance layers (12, 13) are present on only one side of the carrier plate (1). 809831/0593 ORIGINAL INSPECTED